_The Two Arms._--Even this difficulty is often overcome spontaneously, though much more rarely than the former one. As soon as it is detected, the accoucheur must endeavor to return one or both of the limbs, if the labor has not proceeded too far; and if he cannot succeed the delivery must be accomplished as soon as possible, either by turning or with the forceps, unless there be reasonable ground for delay. _The Feet._--Either one or both of the feet may also descend with the head, at first, though they usually recede and allow the head to be born alone. When they are so impacted as to prevent the delivery being completed, the accoucheur must interfere. In most cases he will find it quite easy to push the feet above the head, and allow that to descend alone; but if this is not possible he must introduce one hand, grasp the feet with it, and pull them down, while the other pushes the head up. This will turn the child, and if it be in no immediate danger, and the mother is not suffering, the rest may be left to nature; but if the contrary is the case, the delivery must be finished as speedily as possible. When the head is very low down it may be necessary to use the forceps, but great care must be observed not to grasp the feet along with the head when using them. _A Foot and Arm._--The proceeding is the same as with the foot alone. If the limbs cannot be returned the head and arm must be pushed up, while the foot is brought down. TWINS AND TRIPLETS. In most cases where there are two or more children the delivery is easier than with one, because they are generally small, and the first one so prepares the way that the rest are born without difficulty. It is also a fact that twins are nearly always born before full term, and consequently are not quite grown. The expulsion of the second fœtus usually takes place, immediately after the first, though sometimes the Womb stops contracting, and it is not born for half an hour or more, and it may even remain for hours or days. It is a question whether, in such a case, the second delivery should be left for Nature to finish, or whether the accoucheur should terminate it sooner artificially. The most general practice is to wait only about half an hour, and then, if the Womb is still inert, use friction, or other necessary means, to excite it, and accomplish the second delivery as soon as possible. If there be more than two the proceeding is still the same.